The aim of this study was to evaluate the antifungal activity of the major fraction of fatty acids methyl esters (FAMEs) isolated from Linum usitatissimum L. seeds oil collected from Bechar department (Algeria). The assessment of antifungal activity was carried out in terms of percentage of radial growth on solid medium (potatoes dextrose agar PDA) and biomass growth inhibition on liquid medium (potatoes dextrose broth PDB) against two fungi. The FAMEs was found to be effective in inhibiting the radial mycelial growth of Aspergillus flavus more than Aspergillus ochraceus on all tested concentrations. The highest antifungal index was found to be (54.19%) compared to Aspergillus ochraceus (40.48%). The results of the antifungal activity of the FAMEs inhibition of biomass on liquid medium gave no discounted results, but this does not exclude the antifungal activity. We can assume that the observed antifungal potency may be due to the abundance of linoleic and α-linolenic acids in linseed oil which appears to be promising to treat fungal infections, storage fungi and food spoilage in food industry field.

The objectives of this study were to evaluate the antioxidant properties of principal secondary metabolites of leaves of Prunus persica L. using different in vitro assays, as well as kinetic behavior of DPPH radical scavenging activity. The butanolic fraction afforded the highest yield with 3.86±0.82%. The aqueous extract contains higher levels of total phenolics 27.04±0.83 mg GAE/g DW, the tannins and flavonols were high in the methanolic extract with 41.8±19.49 mg CAE/g DW, 64.93±12.72 mg QRE/g DW respectively, while the flavonoids content 117.72±37.97 mg QRE/g DW were found to be significantly higher in the ethanolic extract as compared to other solvent extracts. The different selective extracts were subjected to assess their antioxidant potential using seven methods. The fractions tested revealed the yellow spots on the TLC plates. The IC50 values based on the DPPH 0.23±0.04 mg/mL, ABTS 0.026±0.005 mg/mL were high in butanolic fraction compared to the IC50 ascorbic acid, which is 0.04±0.01 and 0.009±0.001 mg/mL. The TEC50 reaches equilibrium is 39.84 and 8 min in butanolic fraction and ascorbic acid respectively. Diethyl ether fraction shows an effective antioxidant activity on phosphomolybdate assay, FRAP assay with 436.12±142.27 mg AAE/g and 326.66±11.54 mg Fe(II)E/g respectively at 0.5 mg/mL, while in the hydrogen peroxide assay the value was 26.21±0.06% at 0.015 mg/mL. The obtained results indicate the possibility of pharmacological exploitation of P. persica L. extracts as good source of natural antioxidants.

Background: Oxygen-centre free radicals and other reactive oxygen species (ROS) are continuously produced in vivo, resulting in cell death and tissues damage. Besides, the increasing resistance to existing antimicrobial agents has become a major problem. The present study aims to evaluate the antioxidant and antimicrobial activities of the Thapsia garganica L. leaves and roots. Methods: Broth dilution and single spore methods were developed and seven microorganisms were used. The evaluation was performed by measuring the diameter of the growth inhibition zones around the holes via the determination of the inhibition percentage of mycelium growth. Result: The determination of the polyphenol contents, total flavonoids and condensed tannins of the aqueous extract for both leaves and roots gave respectively (2.21 mg, 2.63 mg/100 mg gallic acide equivalents), (2.39 mg, 0.49 mg/100 mg catechin equivalent), (0.12 mg, 0.04 mg/100 mg catechin equivalent) in dry matter. The results of antioxidant activity showed that the methanolic, flavonoids and tannins extracts showed a potent scavenging activity with IC50 = 0.41; 0.81; 1.39; 1.80 and 1.90 mg/ml, respectively. As regards for antimicrobial activity, an important inhibition of the proposed extracts has been observed against the tested strains.

The lubricating oil industry is widespread in the world, but getting rid of the used oils has become an environmental concern. Lubricating oils are used in industries and cars but potentially contaminate groundwater after use. This research uses montmorillonite clay to refine old oil treated with acetic acid. Compared to more conventional procedures, the suggested strategy for treating waste oil is more cost-effective due to the relatively inexpensive cost of the acid and the modest process conditions. Water content, sediment content, density, flash and fire points, viscosity, viscosity index, total acid and base number, pour points, and refractive index were among the physicochemical parameters of the treated oil that were examined as a result of this treatment. We analyzed the oils using Fourier transform infrared spectroscopy (FTIR) and atomic absorption spectrometry (AAS). New oil (10w 40), old oil, oil treated with acetic acid, and montmorillonite clay were all put through their paces in a battery of tests. The therapy’s physical and chemical alterations were examined across all fields. The findings demonstrated the efficiency of montmorillonite clay due to the strength of the acid to separate the sludge and the lack of compounds hazardous to the environment. The process described here enables recycled oil to be reclaimed as base oil.